python error

Question

tried making simple program in tkinter. i get UnboundLocalError: local variable 'i' referenced before assignment error when i click the button

from tkinter import *

window = Tk()

i = 1
def click():
hellolbl = Label(window, text="Hello")
hellolbl.grid(row=i, column=1)
i += 1

but = Button(window, text = "Here we go", command = click)

but.grid(row=0, column=0)

window.mainloop()

Answer 1

Try to add `global i` below the function head `def click()`. As I understand, variables from outside function are read-only until you specify 'global'.

def click():
global i
# rest of function body here

Answer 2

Just declare i inside click function not outside its scope

Answer 3

from tkinter import *

window = Tk()
i = 1
def click():
global i
hellolbl = Label(window, text="Hello")
hellolbl.grid(row=i, column=1)
i += 1

but = Button(window, text = "Here we go", command = click)

but.grid(row=0, column=0)

window.mainloop()

Answer 4

thank you for answering everyone

HBhZ_C if i put it inside the function, the i would always be 1 when calling grid function so it wouldnt help